[Coco] coco xt-rtc adapter by Burke and Burke (From TandyCoCoForums)

[Bob Devries]

The Burke&Burke interface connected the coco expansion bus to the IBM-PC 
"ISA" bus. Any HD controller could be used, MFM or RLL. In the docs, various 
drive types were suggested, along with controllers which were suitable.

There were in fact 3 cables from the controller card to the drives; One 
control signal cable which daisy chained to the two drives, and one extra 
narrower cable to each drive which carried the data signals.

Two models of the interface existed (IIRC), B&B XT and B&B XT-RTC. The 
difference being that the latter had the DALLAS DS1215 chip and a battery 
fitted. A ROM could be fitted to the IBM-PC controller in place of its BIOS, 
which allowed booting directly from the HD.

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "Bill Pierce" <ooogalapasooo at aol.com>
To: <coco at maltedmedia.com>
Sent: Monday, April 08, 2013 3:03 PM
Subject: Re: [Coco] coco xt-rtc adapter by Burke and Burke (From 
TandyCoCoForums)


>
> Is that all you have of the interface? There is supposed to be a 2nd board 
> that plugs into that one. That's just the coco adapter to plug in the XT 
> interface which is much larger. He was using "off the shelf" IBM 
> compatable XT boards which he could buy cheap as they were being phased 
> out. He had to devise a way to connect it to the Coco and that piece is 
> the adapter.
> Most of his models supported dual drives so they had 2 headers on them for 
> data lines and 2 for controller lines. All in all you had 4 ribbon cables 
> (2 for single drives) coming off the big board going to the drives.
> The Burke and Burke controllers never had a "real" case. They had 2 flat 
> pieces of metal (bronze color, one on each side) in which there were 
> spacers between the plates to hold them the proper width apart and also to 
> mount the boards. The edges were left open. Most times, they didn't fit 
> "just right" into the multipak slot. Easy to knock em out of alignment.
> The "plates" were usually shaped like this "
>
> |-------------------------------|
> |                                     |
> |                                     |
> |                                     |
> |                                     |
> |                                     |
> |___                               |
>       |                              |
>       |_______________|
>
> They usually had the silk screen logo of
>
>
> Burke and Burke XT
> Hard Drive Interface
>
> or
>
> Burke and Burke XT-RTC
>  Hard Drive Interface
>
> stamped on the plate
>
>
> Bill Pierce
> My Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Co-Webmaster of The TRS-80 Color Computer Archive
> http://www.colorcomputerarchive.com/
> Co-Contributor, Co-Editor for CocoPedia
> http://www.cocopedia.com/wiki/index.php/Main_Page
> E-Mail: ooogalapasooo at aol.com
>
>
>
>
> -----Original Message-----
> From: Bob Devries <devries.bob at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Mon, Apr 8, 2013 12:43 am
> Subject: Re: [Coco] coco xt-rtc adapter by Burke and Burke (From Tandy 
> CoCoForums)
>
>
> It looks to me like those pigtails are just the ends of the crystal leads,
> and should in fact have been trimmed.
>
> Regards, Bob Devries
> Dalby, QLD, Australia
>
> ----- Original Message ----- 
> From: "Stephen H. Fischer" <SFischer1 at Mindspring.com>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Monday, April 08, 2013 2:02 PM
> Subject: [Coco] coco xt-rtc adapter by Burke and Burke (From Tandy
> CoCoForums)
>
>
>>
>> http://tandycoco.com/forum/viewtopic.php?p=865#p865
>>
>> Coco xt-rtc problems
>>
>> I have a coco xt-rtc adapter by Burke and Burke. This one is supposedly a
>> pre-production model. Comes without a case. Bought it from a local
>> recycler, who obtained it from a collector who claimed everything worked
>> last time used.. Anyway, I can't get it to work, and from basic
>> inspection, I can see what might be a loose jumper. I'm going to post a
>> link to a my Flickr account, a close up of the board, maybe somebody can
>> tell me if this needs to be soldered to one of the near by points.
>>
>>
>> http://www.flickr.com/photos/94829497@N08/8628815773/
>>
>> I am not sure if it was like this when I got it, or I damaged it on the
>> way home.. Thanks!
>>
>> -Shane
>>
>> --------------------------------
>> Re: Coco xt-rtc problems
>>
>> http://www.flickr.com/photos/94829497@N08/8628815983/in/photostream/
>>
>> Does this help? The top right ic, top 2 pins on the left side..
>>
>> ------------------------------
>>
>> Hi,
>>
>> I do not have this device and cannot tell where this jumper should go 
>> from
>> the pictures.
>>
>> Can anyone else help?
>>
>> SHF
>>
>> --
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